Nature and EnvironmentShoe leather free of toxinsTo view this video please enable JavaScript, and consider upgrading to a web browser that supports HTML5 videoNature and Environment02/21/2016February 21, 2016Tanning shoe leather with barrels full of water and chromium sulfate poses a hazard to tanners, shoe wearers and the environment. Two new alternatives involve tanning in highly pressurized CO2 in special drums and using rhubarb root extract.https://p.dw.com/p/1Hyr6Advertisement